M Fernandes-Whaley, D Prevoo-Franzsen, L Quinn, and N Nhlapo. “How Well Do Our Measurements Measure Up? An Overview of South Africa’s First Proficiency Testing Scheme for Organochlorine Pesticides in Water”. Water SA 41, no. 2 WISA 2014 Special Edition (March 31, 2015). Accessed May 3, 2024. https://watersa.net/article/view/11073.